Answer:
1 grams Cobalt(II) Sulfate = 0.006451787725861 mole using the molecular weight calculator and the molar mass of CoSO4.
Explanation:
A) Oxygen
B) water and oxygen
C) water and carbon dioxide
D) water and carbon monoxide
Answer:
A
Explanation:
this is because combustion is the chemical reaction between surfaces including OXYGEN to generate heat and light in the form of flame
Oxygen is produced by the reaction of sodium peroxide, Na2O2 , and water.
2 Na2O2 (s) + 2 H2O(l) ---> O2(g) + 4 NaOH(aq)
Calculate the mass of Na2O2 in grams needed to form 5.20 g of oxygen.
Answer: 23.53g
Explanation:
5.2/(2x16) = 0.1625 mol
0.1625 x 2 = 0.325 mol
0.325 x (23 x 2 + 16 x 2) = 78 x 0.325 = 23.53g
An atom which has 9 protons, 8 neutrons, and 9 electrons will have an atomic mass of how many amu?
a. 6
b. 8
C. 9
d. 17
Answer:
D
Explanation:
Protons and Neutrons both have a mass of about 1 amu so you add them but electrons have a mass of 0 amu so they are left out.
PLEASEEE HELPPPPPPPPPPPPPPPPPP
Mendeleev's arrangement of the periodic table was in order of increasing ____.
A. atomic number
B. atomic mass
C. neutron number
D. valence electron number
Answer:
B. atomic mass
Explanation:
He arranged the elements into rows in order of increasing mass so that elements with similar properties were in the same column.
A molecular compound is found to consist of30.4% nitrogen and 69.6% oxygen. Ifthe molecule contains 2 atoms of nitrogen, what is the molar mass of the molecule
Answer:
92.01 g/mol
Explanation:
So first you need to find the empirical formula by the percents. That would be, assuming that you have 100 grams of the the sample, divide each quantity of each element found by its respective molar mass.
30.4 g of N ÷ 14 g/mol N= 2.17 mol of N
69.6 g of O ÷ 16g/mol= 4.35 mol of O
You can establish now the empirical formula.
N2.17O4.35,
but since you can't have a decimal subscript, you divide each subscript by the minimum subscript
NO2
So then you're said that the molecular formula derived from that empirical formula has 2 nitrogen, so you multiply all the subscripts, by 2:
N2O4
-Dinitrogen Tetraoxide
-Nitrogen oxide (IV)
Then all you have to do is find the molecular mass of the compound using the periodic table and what you obtain is the molar mass.
remember: molecular mass is correspondent to molar mass.
What are some examples of a physical change? (list more than 2 examples)
look at the picture
Answer:
The strong electric force.
Explanation:
Trust me. If its wrong, comment on this, don't delete it. If someone else answers with the wrong question than other students might get the answer wrong. So if its right, say that it is, if its wrong, tell others what the real answer is.
Read this sentence from Chapter One of Jack London’s The Call of the Wild.
Buck rushed at the splintering wood, sinking his teeth into it, surging and wrestling with it. Wherever the hatchet fell on the outside, he was there on the inside, snarling and growling, as furiously anxious to get out as the man in the red sweater was calmly intent on getting him out.
What is a good prediction question to ask after reading this excerpt?
Answer:
b)
Explanation:
It shows the natrual proggresion of a story and helps blend the narrtive together.
Answer:B
Explanation: i took the quiz on edge
name a metal and non metal which are liquid at normal pressure and temperature
Answer:
metal : Mercury(Hg)
non metal : bromine (Br)
Explanation:
mercury is liquid at room temperature and pressure and the same as bromine
Draw the Complete Electron Energy Level Diagram (or the Orbital Diagram) for Ru+3
Answer:
A
Explanation:
refer to textbook
Which of the following giant covalent structures is a good conductor of electricity?
a) polythene
b) diamond
c) graphite
d) silicon dioixide
PLEASE HELP ASAP I'M SO STRESSED
Answer:
160.3g
Explanation:
We know the equation:
No of moles = mass ÷ Mass of element
We need to find the mass, so make mass the subject of the formula.
Mass = No. of moles × mass of element
Mass = 5 × 32.06
Mass = 160.3g
What are the most of the elements in the periodic table
Answer:
Most of the elements in the periodic table are metals.
Hope that helps. x
Answer:
Here is your answer,mate!
Explanation:
Metals are the most of the elements in the periodic table.
Two atoms of element Q mixed with element E
Both the elements combine together due to incomplete outermost shell.
Two atoms of element Q mixed with element E in order to achieve stability because both the elements have incomplete outermost shell which make them very reactive. In element E we can see that it has 7 electrons while on the other hand, element Q has 5 number of electrons.
For gaining stability, each element has to reach 8 electrons so that's why both the elements react with each other and get stability so we can conclude that both the elements combine together due to incomplete outermost shell.
Learn more about reaction here: https://brainly.com/question/11231920
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Most weak bases are:
a. Anions of weak acids
b. Anions of strong acids
C.Cations of weak acids
d. Both A and C
Answer:
The conjugate base of a very weak acid is stronger than the conjugate base of a strong acid.
Explanation:
The stronger the acid, the weaker its conjugate base and vice versa A very weak acid has a very strong conjugate base.
A glacier can travel over the surface of Earth and reshape it. The chart describes three things a glacier can do.
Glacial Actions:
1. breaks large rocks into smaller ones
2. pushes broken rocks ahead of itself
3. leaves broken rocks behind when the front edge melts
Which terms BEST describe these glacial actions in the order as presented?
a. weathering, erosion, deposition
b. erosion, chemical weathering, deposition
c. deposition, weathering, erosion
d. chemical weathering, mechanical weathering, erosion
Answer:
A
Explanation:
Write method of manufacturing of oxygen gas from liquid air
Answer:
cryogenic distillation process
Explanation:
Cryogenic distinction between carbohydrates and harmon process.
If a sample of gas at constant temperature has its pressure doubled, what will happen to its volume?
Answer:
it'll halve
Explanation:
the gas is compressed with twice the pressure. The volume will be halved.
im certain
50 POINTS PLEASE HELP
2.How many atoms are in 3.35 moles of Aluminum?
3.How many moles of CO2 gas are in a 101.25 L container filled with CO2 gas?
4.What is the mass of 13.7 moles of N2 gas?
Answer:
2) To find the atoms from the moles, you just multiply Avogadro's number (6.02 x 10^23) by the moles.
So 3.35 x (6.02 x 10^23) = 2.0167 x 10^24 atoms are in 3.35 moles of aluminum
3) If the question is asking under standard temperature and pressure, we know that if we divide the volume by the molar volume of a gas (which is 22.7 in standard temperature and pressure), we can get the moles.
So 101.25L / 22.7 = 4.46 mol
4) We know that to find the moles, it is the mass divided by the molar mass. If we rearrange the equation to solve for mass, we have to multiply the moles by the molar mass to get there.
Nitrogen's (N) molar mass on the periodic table is 14g/mol, but since Nitrogen is a diatomic element, it would be N2 by itself. So multiply 14 by 2, which will give you 28g/mol. N2's molar mass is 28g/mol.
Now you multiply 13.7 moles by 28g/mol, which will give you 383.6g
Just did a few edits here, 4.46 for question 3 is in moles not L
Taking into account the definition of avogadro's number,
2. 3.35 moles of aluminum contains 2.018ײ⁴ atoms.
3. 4.52 moles of CO₂ gas are in a 101.25 L container filled with CO₂ gas.
4. 13.7 moles of N₂ contain 383.6 grams.
2. How many atoms are in 3.35 moles of Aluminum?
Avogadro's Number is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.
Then you can apply the following rule of three: if 1 mole of aluminum contains 6.023×10²³ atoms, then 3.35 moles of aluminum contains how many atoms?
amount of atoms of aluminum= (6.023×10²³ atoms × 3.35 moles)÷ 1 mole
amount of atoms of aluminum=2.018ײ⁴ atoms
Finally, 3.35 moles of aluminum contains 2.018ײ⁴ atoms.
3.How many moles of CO₂ gas are in a 101.25 L container filled with CO₂ gas?The STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.
Then, you can apply the following rule of three: If by definition of the STP conditions 1 mole of CO₂ occupies a volume of 22.4 L, how many moles does 101.25 L occupy?
[tex]amount of moles of CO_{2} =\frac{101.25 Lx1 mole of CO_{2} }{22.4 L}[/tex]
amount of moles of CO₂= 4.52 moles
4.52 moles of CO₂ gas are in a 101.25 L container filled with CO₂ gas.
4. What is the mass of 13.7 moles of N₂ gas?The molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.
In this case, the molar mass of N₂ is 28 g/mole. So, you can apply the following rule of three: If 1 mole of N₂ contains 28 grams, 13.7 moles of N₂ contain how much mass?
[tex]mass=\frac{13.7 moles x28 grams}{1 mole}[/tex]
mass= 383.6 grams
13.7 moles of N₂ contain 383.6 grams.
Learn more about
Avogadro's Number: brainly.com/question/11907018?referrer=searchResults brainly.com/question/1445383?referrer=searchResults brainly.com/question/1528951?referrer=searchResultsSTP conditions:brainly.com/question/3773297?referrer=searchResults brainly.com/question/9901446?referrer=searchResults brainly.com/question/12695086?referrer=searchResults brainly.com/question/15507610?referrer=searchResults brainly.com/question/14260169?referrer=searchResults brainly.com/question/14831640?referrer=searchResultsmolar mass:https://brainly.com/question/114527911. The ease with which water can pass
through a rock or sediment is called
a. permeability c. porosity.
b. carbonation. d. velocity
Answer:
It's option a) Permeability.
In one to two sentences, explain how to compare the strength of electrostatic forces between molecules in salt water to the strength of electrostatic forces between molecules in freshwater. Include a description of the data to be collected and how that data would allow one to draw conclusions about the relative strengths of the electrostatic forces in the two substances.
The boiling point of salt water is greater than that of fresh water hence the electrostatic forces between molecules in salt water is greater than that between the molecules in salt water.
Fresh water contains does not contain dissolved solutes like salt water. Salt water contains a lot of dissolved mineral salts making the salt water to be rich in ions.
Generally, the boiling points of substances can serve as a measure of the strength of electrostatic forces between molecules in either kind of water. We will easily find the that the boiling point of salt water is far higher than that of fresh water indicating greater electrostatic forces between molecules in salt water than between molecules in fresh water.
Learn more about boiling point: https://brainly.com/question/2153588
Which term describes the small, somewhat circular pattern of wind?
A Easterlies
B Trade Winds
C polar winds
D convection cells
Answer:
its D, convection cells
5. How many grams of calcium carbonate (CaCO3) are needed to maker 1 liter of 2-molar solution?
029
O 100.19
O 50.19
O 200.2g
Answer: Molar masses 40.8 and 100.1
Explanation:
HELP!! Will give brainliness of answered!!
No links!!!!!!
Why does higher temperature increase the reaction rate?
Select one:
The molecules will have higher kinetic energy for higher velocity collisions.
O b. Increasing the temperature causes the reactant molecules to get hotter.
O c. The activation energy will decrease.
O d. Increasing the temperature causes the potential energy in the bonds to decrease.
Check
Answer:
a
Explanation:
Answer:
Im pretty sure it's B, almost 100% sure
Explanation:
What is a Chemical Properties and Physical Properties? Please tell me the deffinition of them both.
Answer:
All properties of matter are either physical or chemical properties and physical properties are either intensive or extensive. ... Physical properties can be measured without changing a substance's chemical identity. Chemical properties can be measured only by changing a substance's chemical identity.
Explanation:
the expression of potential energy , i.e., P.E.=mgh , where the terms used have their usual meaning
Gravitational Potential energy:
The Gravitational potential energy of
an object at a point above the ground
is defined as the work done in raising
it from the ground to that point against
gravity.
Consider an object of mass "m" is raised
to heighth from the ground.
A force is required to do this. the
minimum force required to raise the
object is equal to the weight of the
object[mg]
The object gains energy equal to the
work done on it. Let the work done on
the object against gravity be "w"
WorkDone=W= Force x displacement
=mgxh
..W=mgh
since the workdone on the object is
equal to "mgh" an energy equal to "mgh"
units is gained by object.This is the
potential energy of object at height "h"
.. P.E=mgh
If the temperature changes by 100 K, by how much does it change in degrees Celsius?
A. 0 degrees Celsius
B. 100 degrees Celsius
C. 37 degrees Celsius
D. 273 degrees Celsius
Taking into account the degrees Celsius and Kelvin, if the temperature changes by 100 K, by 100 degrees Celsius it change in degrees Celsius.
A degree Centigrade is a unit of temperature (the physical quantity that reveals the level of heat) whose symbol is °C.
On the other hand, the degree Kelvin, whose symbol is K, is the unit of temperature on the scale created by William Thomson Kelvin, in 1848, based on the degree Celsius, he established his zero point (0) at zero absolute (-273.15 ° C). The figure 0 K is equivalent to the theoretical point where gases have no volume. Absolute zero or 0 K is the point where molecules theoretically stop moving. It is the "perfect" cold.
Considering that zero on the Celsius or degrees centigrade (0 ° C) scale is defined as the equivalent of 273.15 K, the conversion from degrees ° C to K is carried out using the following expression:
T(K)= T(°C) + 273.15 K
In this case, if the temperature changes by 100 K, as it is a change in temperature, the numerical value in K units is the same in ° C units.
Then, the correct answer is option B. if the temperature changes by 100 K, by 100 degrees Celsius it change in degrees Celsius.
Learn more about degrees Celsius and Kelvin:
https://brainly.com/question/2800860?referrer=searchResultsSilicone is a type of synthetic compound made of silicon, oxygen, and other elements. There are many different kinds of silicone. One kind is a liquid and is commonly used as a lubricant to reduce friction between moving parts. Unlike petroleum-based lubricants, silicone is nontoxic. However, silicone is more expensive than petroleum-based lubricants.
Which of the following would silicone lubricants most likely be used for?
Explanation:
Liquid-based lubricant
Answer:
study island : food service equipment
Explanation:
How do you determine the group and period of an element based on its electron configuration?
Answer:
If you are given with the atomic number of an element you can find it's period number and group number. The period number is related to the number of electron occupied shells in the element and the period number is linked to its valence electrons.
Explanation:
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